diff --git a/azbox/dmx.cpp b/azbox/dmx.cpp
index 099901a..7130597 100644
--- a/azbox/dmx.cpp
+++ b/azbox/dmx.cpp
@@ -277,13 +277,12 @@ bool cDemux::sectionFilter(unsigned short pid, const unsigned char * const filte
 			   const unsigned char * const mask, int len, int timeout,
 			   const unsigned char * const negmask)
 {
-	int length = len;
 	memset(&s_flt, 0, sizeof(s_flt));
 
 	if (len > DMX_FILTER_SIZE)
 	{
 		lt_info("%s #%d: len too long: %d, DMX_FILTER_SIZE %d\n", __func__, num, len, DMX_FILTER_SIZE);
-		length = DMX_FILTER_SIZE;
+		len = DMX_FILTER_SIZE;
 	}
 	s_flt.pid = pid;
 	s_flt.timeout = timeout;
diff --git a/generic-pc/dmx.cpp b/generic-pc/dmx.cpp
index 7a61a90..9d15091 100644
--- a/generic-pc/dmx.cpp
+++ b/generic-pc/dmx.cpp
@@ -247,13 +247,12 @@ bool cDemux::sectionFilter(unsigned short pid, const unsigned char * const filte
 			   const unsigned char * const mask, int len, int timeout,
 			   const unsigned char * const negmask)
 {
-	int length = len;
 	memset(&s_flt, 0, sizeof(s_flt));
 
 	if (len > DMX_FILTER_SIZE)
 	{
 		lt_info("%s #%d: len too long: %d, DMX_FILTER_SIZE %d\n", __func__, num, len, DMX_FILTER_SIZE);
-		length = DMX_FILTER_SIZE;
+		len = DMX_FILTER_SIZE;
 	}
 	s_flt.pid = pid;
 	s_flt.timeout = timeout;
diff --git a/libspark/dmx.cpp b/libspark/dmx.cpp
index cf88aa0..142b84a 100644
--- a/libspark/dmx.cpp
+++ b/libspark/dmx.cpp
@@ -357,7 +357,6 @@ bool cDemux::sectionFilter(unsigned short pid, const unsigned char * const filte
 			   const unsigned char * const mask, int len, int timeout,
 			   const unsigned char * const negmask)
 {
-	int length = len;
 	memset(&s_flt, 0, sizeof(s_flt));
 
 	_open();
@@ -365,7 +364,7 @@ bool cDemux::sectionFilter(unsigned short pid, const unsigned char * const filte
 	if (len > DMX_FILTER_SIZE)
 	{
 		lt_info("%s #%d: len too long: %d, DMX_FILTER_SIZE %d\n", __func__, num, len, DMX_FILTER_SIZE);
-		length = DMX_FILTER_SIZE;
+		len = DMX_FILTER_SIZE;
 	}
 	s_flt.pid = pid;
 	s_flt.timeout = timeout;
diff --git a/libtriple/dmx_td.cpp b/libtriple/dmx_td.cpp
index 3c4b1e1..073b2cd 100644
--- a/libtriple/dmx_td.cpp
+++ b/libtriple/dmx_td.cpp
@@ -349,12 +349,12 @@ bool cDemux::sectionFilter(unsigned short pid, const unsigned char * const filte
 	s_flt.filter[0] = filter[0];
 	s_flt.mask[0] = mask[0];
 	s_flt.timeout = timeout;
-	memcpy(&s_flt.filter[3], &filter[1], len - 1);
-	memcpy(&s_flt.mask[3],   &mask[1],   len - 1);
+	memcpy(&s_flt.filter[3], &filter[1], length - 1);
+	memcpy(&s_flt.mask[3],   &mask[1],   length - 1);
 	if (negmask != NULL)
 	{
 		s_flt.positive[0] = negmask[0];
-		memcpy(&s_flt.positive[3], &negmask[1], len - 1);
+		memcpy(&s_flt.positive[3], &negmask[1], length - 1);
 	}
 
 	s_flt.flags = XPDF_IMMEDIATE_START;